OSHA Heat Rules in 2026: What Crew Leaders Need to Know

If you run a crew, you have probably heard that OSHA is cracking down on heat. You may have also heard there is no federal heat rule. Both are true, and the gap between them is where most employers get caught.

Here is where things actually stand going into the back half of 2026, and what it means for the people working your sites.

There is still no federal heat standard

OSHA does not have a regulation that specifically addresses working in heat. Not for outdoor work, not for indoor work.

The agency published a proposed rule in August 2024 titled "Heat Injury and Illness Prevention in Outdoor and Indoor Work Settings." It drew more than 43,000 public comments. Hearings were held in the summer of 2025, and a final round of comments closed that October. Since then, the rulemaking has not moved.

Federal rulemaking is slow by design. The silica standard took decades from first proposal to final rule. Nobody should be waiting on a heat standard to decide how they run a hot job site.

You can still be cited

This is the part that surprises people.

The General Duty Clause of the Occupational Safety and Health Act requires employers to provide a workplace free from recognized hazards likely to cause death or serious physical harm. Heat is a recognized hazard. OSHA has used that clause to cite employers over heat illness for years, and it does not require a heat-specific standard to do it.

OSHA also maintains a National Emphasis Program focused on heat-related hazards, which directs inspection resources toward high-risk industries and allows compliance officers to open heat inquiries during inspections opened for other reasons.

And a number of states run their own enforceable heat standards through state OSHA plans. California has led on this for years and has extended its requirements to indoor workplaces. If you operate across state lines, the rules may change when you cross one.

What the proposed rule would require

Even though it has not been finalized, the proposed standard is worth reading, because it tells you what OSHA considers reasonable. If you are ever defending your practices, that document is the benchmark you will be measured against.

The proposal sets two trigger points based on heat index:

• 80°F initial trigger. Access to drinking water, break areas, and acclimatization procedures for new or returning workers.
• 90°F high heat trigger. Paid 15-minute rest breaks every two hours, plus observation for signs of heat illness.

It would also require a written heat injury and illness prevention plan specific to the site, a designated heat safety coordinator, and training for workers and supervisors.

Whether or not this rule ever lands, a crew that already works this way is in good shape.

The first week is the dangerous one

If you take one thing from the proposed rule, make it acclimatization.

A significant share of serious heat illness happens to workers in their first days on a hot job. New hires, guys coming back from vacation, anyone off for a week or more. The body adapts to heat over roughly one to two weeks, and until it does, the same conditions the rest of the crew handles fine can put a new guy down.

The proposed rule addresses this directly: gradual exposure for new workers during their first week, and for anyone returning after seven or more days away.

This costs nothing to implement. It is scheduling, not equipment.

Water, rest, shade

OSHA's long-running campaign comes down to three words, and they are still the foundation.

Water. Cool drinking water, close enough that taking a drink is not a trip. If a guy has to walk to the truck, he will wait until he is thirsty, and thirst is a late signal.

Rest. Scheduled breaks, not breaks taken when someone feels bad. By the time a worker recognizes he needs one, he is already behind.

Shade. A real break area out of direct sun where body temperature can actually come down. A truck cab with the AC running counts. Standing behind a stack of material does not.

Where electrolytes come in

Sweat is not just water. It carries sodium, along with smaller amounts of potassium, magnesium and calcium. Over a full shift in heat, a worker can lose a meaningful amount of both fluid and minerals.

For shorter jobs, water handles it. For long shifts in serious heat, OSHA's own guidance has pointed toward electrolyte-containing beverages as an addition to water, not a replacement for it.

The practical point for a crew leader: someone drinking water all day and still cramping, still dragging in the afternoon, is not necessarily under-hydrated. He may be replacing the fluid and not the minerals that went out with it.

That is not a substitute for water, rest and shade. It sits alongside them.

A working checklist

None of this requires a consultant. If you want to get ahead of it this season:

• Write the plan down. Site-specific, one or two pages. A plan you cannot produce on request is not a plan.
• Name someone responsible for watching conditions and calling breaks.
• Check the heat index, not the temperature. Humidity is what makes 88°F dangerous.
• Ease in new and returning workers over their first week.
• Put water where the work is and keep it cool.
• Schedule breaks rather than waiting for someone to ask.
• Train the crew to recognize symptoms in each other. Confusion and stumbling are emergencies, not toughness problems.
• Know how an ambulance gets to your location. On a large site, that is not obvious.
• Check your state. Several have their own enforceable requirements.

The short version

There is no federal heat standard, and there may not be one for a while. That does not mean there is no exposure. The General Duty Clause has been enough to support citations for years, several states enforce their own rules, and a crew that goes down in the heat is a problem long before any inspector shows up.

The proposed rule is a reasonable blueprint. Most of it is scheduling and attention rather than spending.

Redi makes sugar-free electrolyte sticks built for people working long days in hot conditions. If you are stocking a crew, our For Crews page has bulk pricing and a quote form.

This article is general information about OSHA requirements, not legal advice or a compliance determination. Consult OSHA directly or a qualified safety professional regarding your specific obligations.